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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpio/gpio-mb86s7x.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpio/gpio-mb86s7x.c')
-rw-r--r--drivers/gpio/gpio-mb86s7x.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mb86s7x.c b/drivers/gpio/gpio-mb86s7x.c
new file mode 100644
index 000000000..37c5363e3
--- /dev/null
+++ b/drivers/gpio/gpio-mb86s7x.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/drivers/gpio/gpio-mb86s7x.c
+ *
+ * Copyright (C) 2015 Fujitsu Semiconductor Limited
+ * Copyright (C) 2015 Linaro Ltd.
+ */
+
+#include <linux/acpi.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+#include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+/*
+ * Only first 8bits of a register correspond to each pin,
+ * so there are 4 registers for 32 pins.
+ */
+#define PDR(x) (0x0 + x / 8 * 4)
+#define DDR(x) (0x10 + x / 8 * 4)
+#define PFR(x) (0x20 + x / 8 * 4)
+
+#define OFFSET(x) BIT((x) % 8)
+
+struct mb86s70_gpio_chip {
+ struct gpio_chip gc;
+ void __iomem *base;
+ struct clk *clk;
+ spinlock_t lock;
+};
+
+static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&gchip->lock, flags);
+
+ val = readl(gchip->base + PFR(gpio));
+ val &= ~OFFSET(gpio);
+ writel(val, gchip->base + PFR(gpio));
+
+ spin_unlock_irqrestore(&gchip->lock, flags);
+
+ return 0;
+}
+
+static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&gchip->lock, flags);
+
+ val = readl(gchip->base + PFR(gpio));
+ val |= OFFSET(gpio);
+ writel(val, gchip->base + PFR(gpio));
+
+ spin_unlock_irqrestore(&gchip->lock, flags);
+}
+
+static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+ unsigned long flags;
+ unsigned char val;
+
+ spin_lock_irqsave(&gchip->lock, flags);
+
+ val = readl(gchip->base + DDR(gpio));
+ val &= ~OFFSET(gpio);
+ writel(val, gchip->base + DDR(gpio));
+
+ spin_unlock_irqrestore(&gchip->lock, flags);
+
+ return 0;
+}
+
+static int mb86s70_gpio_direction_output(struct gpio_chip *gc,
+ unsigned gpio, int value)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+ unsigned long flags;
+ unsigned char val;
+
+ spin_lock_irqsave(&gchip->lock, flags);
+
+ val = readl(gchip->base + PDR(gpio));
+ if (value)
+ val |= OFFSET(gpio);
+ else
+ val &= ~OFFSET(gpio);
+ writel(val, gchip->base + PDR(gpio));
+
+ val = readl(gchip->base + DDR(gpio));
+ val |= OFFSET(gpio);
+ writel(val, gchip->base + DDR(gpio));
+
+ spin_unlock_irqrestore(&gchip->lock, flags);
+
+ return 0;
+}
+
+static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+
+ return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio));
+}
+
+static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+ struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
+ unsigned long flags;
+ unsigned char val;
+
+ spin_lock_irqsave(&gchip->lock, flags);
+
+ val = readl(gchip->base + PDR(gpio));
+ if (value)
+ val |= OFFSET(gpio);
+ else
+ val &= ~OFFSET(gpio);
+ writel(val, gchip->base + PDR(gpio));
+
+ spin_unlock_irqrestore(&gchip->lock, flags);
+}
+
+static int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
+{
+ int irq, index;
+
+ for (index = 0;; index++) {
+ irq = platform_get_irq(to_platform_device(gc->parent), index);
+ if (irq < 0)
+ return irq;
+ if (irq == 0)
+ break;
+ if (irq_get_irq_data(irq)->hwirq == offset)
+ return irq;
+ }
+ return -EINVAL;
+}
+
+static int mb86s70_gpio_probe(struct platform_device *pdev)
+{
+ struct mb86s70_gpio_chip *gchip;
+ int ret;
+
+ gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL);
+ if (gchip == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, gchip);
+
+ gchip->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(gchip->base))
+ return PTR_ERR(gchip->base);
+
+ gchip->clk = devm_clk_get_optional(&pdev->dev, NULL);
+ if (IS_ERR(gchip->clk))
+ return PTR_ERR(gchip->clk);
+
+ ret = clk_prepare_enable(gchip->clk);
+ if (ret)
+ return ret;
+
+ spin_lock_init(&gchip->lock);
+
+ gchip->gc.direction_output = mb86s70_gpio_direction_output;
+ gchip->gc.direction_input = mb86s70_gpio_direction_input;
+ gchip->gc.request = mb86s70_gpio_request;
+ gchip->gc.free = mb86s70_gpio_free;
+ gchip->gc.get = mb86s70_gpio_get;
+ gchip->gc.set = mb86s70_gpio_set;
+ gchip->gc.to_irq = mb86s70_gpio_to_irq;
+ gchip->gc.label = dev_name(&pdev->dev);
+ gchip->gc.ngpio = 32;
+ gchip->gc.owner = THIS_MODULE;
+ gchip->gc.parent = &pdev->dev;
+ gchip->gc.base = -1;
+
+ ret = gpiochip_add_data(&gchip->gc, gchip);
+ if (ret) {
+ dev_err(&pdev->dev, "couldn't register gpio driver\n");
+ clk_disable_unprepare(gchip->clk);
+ return ret;
+ }
+
+ acpi_gpiochip_request_interrupts(&gchip->gc);
+
+ return 0;
+}
+
+static int mb86s70_gpio_remove(struct platform_device *pdev)
+{
+ struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev);
+
+ acpi_gpiochip_free_interrupts(&gchip->gc);
+ gpiochip_remove(&gchip->gc);
+ clk_disable_unprepare(gchip->clk);
+
+ return 0;
+}
+
+static const struct of_device_id mb86s70_gpio_dt_ids[] = {
+ { .compatible = "fujitsu,mb86s70-gpio" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = {
+ { "SCX0007" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids);
+#endif
+
+static struct platform_driver mb86s70_gpio_driver = {
+ .driver = {
+ .name = "mb86s70-gpio",
+ .of_match_table = mb86s70_gpio_dt_ids,
+ .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids),
+ },
+ .probe = mb86s70_gpio_probe,
+ .remove = mb86s70_gpio_remove,
+};
+module_platform_driver(mb86s70_gpio_driver);
+
+MODULE_DESCRIPTION("MB86S7x GPIO Driver");
+MODULE_ALIAS("platform:mb86s70-gpio");
+MODULE_LICENSE("GPL");